Isotope effects in nucleophilic substitution reactions. IV. The effect of changing a substituent at the α carbon on the structure of S<sub>N</sub>2 transition states
作者:Kenneth Charles Westaway、Zbigniew Waszczylo
DOI:10.1139/v82-360
日期:1982.10.1
Kinetic studies, secondaryα-deuterium kinetic isotopeeffects, primary chlorine kinetic isotopeeffects (1), Hammett ρ values determined by changing the substituent in the nucleophile, and activation parameters have been used to determine the detailed (relative) structures of the transition states for the SN2 reactions between para-substituted benzyl chlorides and thiophenoxide ion. A rationale for
A metal-free procedure for the synthesis of thioethers is described via the base-promoted reductive coupling of tosylhydrazones with thiols through an insertion of a carbene into the S–H bond.
Synthesis and Functionalization of Thiophosphonium Salts: A Divergent Approach to Access Thioether, Thioester, and Dithioester Derivatives
作者:Gurupada Hazra、Ahmad Masarwa
DOI:10.1021/acs.orglett.3c02422
日期:2023.9.1
practical method for efficiently obtaining a diverse range of thiophosphonium salts. This method involves the direct coupling of commercially available thiols and aldehydes with Ph3P and TfOH. The setup is simple and carried out in a metal-free manner. The synthetic utility of these salts is demonstrated through various examples of C–P bond functionalizations, enabling the synthesis of thioether, deuterated